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From mans2singh <...@git.apache.org>
Subject [GitHub] nifi pull request #502: Nifi-1972 Apache Ignite Put Cache Processor
Date Fri, 10 Jun 2016 00:23:18 GMT
Github user mans2singh commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/502#discussion_r66544841
  
    --- Diff: nifi-nar-bundles/nifi-ignite-bundle/nifi-ignite-processors/src/main/java/org/apache/nifi/processors/ignite/cache/PutIgniteCache.java
---
    @@ -0,0 +1,373 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.nifi.processors.ignite.cache;
    +
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.util.AbstractMap;
    +import java.util.ArrayList;
    +import java.util.HashMap;
    +import java.util.List;
    +import java.util.Map;
    +
    +import org.apache.commons.lang3.StringUtils;
    +import org.apache.ignite.IgniteDataStreamer;
    +import org.apache.ignite.lang.IgniteFuture;
    +import org.apache.nifi.annotation.behavior.EventDriven;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.ReadsAttribute;
    +import org.apache.nifi.annotation.behavior.ReadsAttributes;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.behavior.WritesAttribute;
    +import org.apache.nifi.annotation.behavior.WritesAttributes;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.annotation.lifecycle.OnStopped;
    +import org.apache.nifi.components.AllowableValue;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.io.InputStreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.stream.io.StreamUtils;
    +
    +/**
    + * Put cache processors which pushes the flow file content into Ignite Cache using
    + * DataStreamer interface
    + */
    +@EventDriven
    +@SupportsBatching
    +@Tags({ "Ignite", "insert", "update", "stream", "write", "put", "cache", "key" })
    +@InputRequirement(Requirement.INPUT_REQUIRED)
    +@CapabilityDescription("Stream the contents of a FlowFile to Ignite Cache using DataStreamer.
" +
    +    "The processor uses the value of FlowFile attribute " + PutIgniteCache.IGNITE_CACHE_ENTRY_KEY
+ " as the " +
    +    "cache key and the byte array of the FlowFile as the value of the cache entry value.
 Both the string key and a " +
    +    " non-empty byte array value are required otherwise the FlowFile is transfered to
the failure relation.")
    +@WritesAttributes({
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_TOTAL_COUNT, description
= "The total number of FlowFile in the batch"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_ITEM_NUMBER, description
= "The item number of FlowFile in the batch"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_SUCCESSFUL_ITEM_NUMBER,
description = "The successful FlowFile item number"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_SUCCESSFUL_COUNT,
description = "The number of successful FlowFiles"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_FAILED_ITEM_NUMBER,
description = "The failed FlowFile item number"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_FAILED_COUNT,
description = "The total number of failed FlowFiles in the batch"),
    +    @WritesAttribute(attribute = PutIgniteCache.IGNITE_BATCH_FLOW_FILE_FAILED_REASON_ATTRIBUTE_KEY,
description = "The failed reason attribute key")
    +    })
    +@ReadsAttributes({
    +    @ReadsAttribute(attribute = PutIgniteCache.IGNITE_CACHE_ENTRY_KEY, description =
"Ignite cache key"),
    +    })
    +public class PutIgniteCache extends AbstractIgniteCacheProcessor {
    +
    +    /**
    +     * The batch size of flow files to be processed on invocation of onTrigger
    +     */
    +    public static final PropertyDescriptor BATCH_SIZE = new PropertyDescriptor.Builder()
    +            .name("Batch Size For Entries")
    +            .description("Batch size for entries (1-500).")
    +            .defaultValue("250")
    --- End diff --
    
    I just picked a number for processing in a single batch to avoid buffering too many objects
in memory.  If you have any advice based on your experience, I can change it.


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